HVAC system IO

Hi guys,

just a quick question regarding the in-built system IO for HVAC controls
with regard to the zones, and the option to select multiples of them.

is (GetBoolIBSystemIO("HVAC Plant Heating", 1, HVACZone123) = ON)

the same as
(GetBoolIBSystemIO("HVAC Plant Heating", 1, HVACZone1) = ON) or
(GetBoolIBSystemIO("HVAC Plant Heating", 1, HVACZone2) = ON) or
(GetBoolIBSystemIO("HVAC Plant Heating", 1, HVACZone3) = ON)


OR

(GetBoolIBSystemIO("HVAC Plant Heating", 1, HVACZone123) = ON)

the same as
(GetBoolIBSystemIO("HVAC Plant Heating", 1, HVACZone1) = ON) and
(GetBoolIBSystemIO("HVAC Plant Heating", 1, HVACZone2) = ON) and
(GetBoolIBSystemIO("HVAC Plant Heating", 1, HVACZone3) = ON)

or none of the above

Thanks

Grant

 

It is not actually either of the above. From the help file topic "HVAC App In-built System IO":

 

thanks darren,

so what you are saying is that i would have to use all 4 statements:

123 or
1 or
2 or
3 then...

to be able to determine if the heating is on in any zone?
Given that i have 4 pages to control heating:
1. for whole of house (123) which sets all zones to same temp and mode
2. for zone 1 only (1)
3. for zone 2 only (2)
4. for zone 3 only (3)

Is this correct?

Thanks

Grant

 

This is not quite right. The HVAC Plant Heating in-built system IO tells you whether the plant itself is currently heating, not whether an individual zone is heating. The plant can only be doing one thing at a time (ie. heating or not heating) so you can just use HVACZone123 to find out if the plant is currently heating.

A zone will be heating if the plant is heating and the zone damper is open.

 

i don't disagree, but it gives me the option to select individual zones... or collectively as a group of zones... don't tell me i've become dave byron, finding issued with software